Region
United States
243
Connecticut
9
California
7
North Carolina
6
Arizona
5
New York (State)
5
Mississippi
4
Texas
4
Virginia
4
Washington (D.C.)
4
Alaska
3
Florida
3
Klamath River (Or. and Calif.)
3
Maryland
3
Massachusetts
3
Missouri
3
New Mexico
3
Pennsylvania
3
Wisconsin
3
Georgia
2
Hawaii
2
Illinois
2
Indiana
2
Japan
2
Louisiana
2
Michigan
2
Mission Viejo
2
Nebraska
2
New York
2
North Dakota
2
Ohio
2
Oregon
2
Tennessee
2
Alabama
1
Albuquerque
1
Argonne
1
Arkansas
1
Chicxulub Crater
1
Colorado
1
Delaware
1
Detroit
1
Developing countries
1
Front Royal
1
Guam
1
Hilo
1
Iowa
1
Juneau
1
Kentucky
1
Los Angeles
1
Maine
1
more ...